CO 5) What should be the coefficient of hydrogen, H2, in the following equation

Question

CO 5) What should be the coefficient of hydrogen, H2, in the following equation in order to make it balanced? 2 Al + 3 H2SO4 ---> Al2(SO4)3 + ? H2 (Points : 5)

Explanation / Answer

Starting with Al + H2SO4 -----------> Al2(SO4)3 + H2: We have one aluminium on the left, two on the right, so put a 2 in front of Al: 2Al + H2SO4 -----------> Al2(SO4)3 + H2 There are three sulfate ions on the right and one on the left, so put a 3 in front of sulfuric acid on the left: 2Al + 3H2SO4 -----------> Al2(SO4)3 + H2 Now there are six hydrogen atoms on the left, and two on the right. We need four more on the right, which can be done by adding another two H2 molecules: 2Al + 3H2SO4 -----------> Al2(SO4)3 + 3H2

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